Cain was unaware of the tales being told about Robert or how the Lightning Knight's fame had skyrocketed at his expense. Even if he had known, he wouldn't have cared in the slightest, as the opinion of the masses had never held any importance for him.
The truth was that his sudden weakened and chaotic life force during the battle had all been a calculated ploy. It was designed to trick the South Coast Alliance, making Lord Zero's survival story more credible.
After escaping Robert's relentless pursuit, Cain sought refuge in a massive poisonous swamp. The swamp was so toxic that even normal Legends avoided it due to its harmful gasses, making it a perfect place to lay low.
Though the poisonous gasses that covered everything would have troubled even normal Stellar Abyss Legends, they were of no concern for an Ancient Dragon as massive as Cain, whose vitality raged like an unstoppable force.